Multiple people have suggested to compile-test UAPI headers. Currently, Kbuild provides simple sanity checks by headers_check but they are not enough to catch bugs. The most recent patch I know is David Howells' work: https://patchwork.kernel.org/patch/10590203/ I agree that we need better tests for UAPI headers, but I want to integrate it in a clean way. The idea that has been in my mind is to compile each header to make sure the selfcontainedness. Recently, Jani Nikula proposed a new syntax 'header-test-y'. https://patchwork.kernel.org/patch/10947005/ So, I implemented UAPI compile-testing on top of that. When adding a new feature, cleaning the code first is a good practice. [1] Remove headers_install_all This target installs UAPI headers of all architectures in a single tree. It does not make sense to compile test of headers from multiple arches at the same time. Hence, removed. [2] Split header installation into 'make headers' and 'make headers_install' To compile-test UAPI headers, we need a work-directory somewhere to save objects and .*.cmd files. usr/include/ will be the work-directory. Since we cannot pollute the final destination of headers_install, I split the header installation into two stages. 'make headers' will build up the ready-to-install headers in usr/include, which will be also used as a work-directory for the compile-test. 'make headers_install' will copy headers from usr/include to $(INSTALL_HDR_PATH)/include. [3] Support compile-test of UAPI headers This is implemented in usr/include/Makefile Jani Nikula (1): kbuild: add support for ensuring headers are self-contained Masahiro Yamada (14): kbuild: remove headers_{install,check}_all kbuild: remove stale dependency between Documentation/ and headers_install kbuild: make gdb_script depend on prepare0 instead of prepare kbuild: fix Kconfig prompt of CONFIG_HEADERS_CHECK kbuild: add CONFIG_HEADERS_INSTALL and loosen the dependency of samples kbuild: remove build_unifdef target in scripts/Makefile kbuild: build all prerequisite of headers_install simultaneously kbuild: add 'headers' target to build up ready-to-install uapi headers kbuild: re-implement Makefile.headersinst without directory descending kbuild: move hdr-inst shorthand to top Makefile kbuild: simplify scripts/headers_install.sh kbuild: deb-pkg: do not run headers_check fixup: kbuild: add support for ensuring headers are self-contained kbuild: compile test UAPI headers to ensure they are self-contained Documentation/kbuild/headers_install.txt | 7 -- Documentation/kbuild/makefiles.txt | 13 ++- Makefile | 56 +++++----- arch/arc/configs/tb10x_defconfig | 1 + arch/nds32/configs/defconfig | 1 + arch/parisc/configs/a500_defconfig | 1 + arch/parisc/configs/b180_defconfig | 1 + arch/parisc/configs/c3000_defconfig | 1 + arch/parisc/configs/default_defconfig | 1 + arch/powerpc/configs/ppc6xx_defconfig | 1 + arch/s390/configs/debug_defconfig | 1 + include/uapi/{linux => }/Kbuild | 6 +- init/Kconfig | 20 ++++ lib/Kconfig.debug | 25 +++-- samples/Kconfig | 14 ++- samples/Makefile | 4 +- scripts/Kbuild.include | 6 -- scripts/Makefile | 5 - scripts/Makefile.build | 9 ++ scripts/Makefile.headersinst | 132 ++++++++++------------- scripts/Makefile.lib | 3 + scripts/cc-system-headers.sh | 8 ++ scripts/headers.sh | 29 ----- scripts/headers_install.sh | 48 ++++----- scripts/package/builddeb | 2 +- usr/.gitignore | 1 - usr/Makefile | 2 + usr/include/.gitignore | 3 + usr/include/Makefile | 132 +++++++++++++++++++++++ 29 files changed, 329 insertions(+), 204 deletions(-) rename include/uapi/{linux => }/Kbuild (77%) create mode 100755 scripts/cc-system-headers.sh delete mode 100755 scripts/headers.sh create mode 100644 usr/include/.gitignore create mode 100644 usr/include/Makefile -- 2.17.1
